Fatto generale: 19984 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 19984 is an uninteresting number.
Trivia: 19984 is an uninteresting number.
Data storica: September 17th is the day in 1908 that the Wright Flyer flown by Orville Wright, with Lieutenant Thomas Selfridge as passenger, crashes killing Selfridge.